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Formation of diethylamine thermal ionization mass spectrum on NaAu_x intermetallide

Mikhail V Knatko¹, Mikhail N Lapushkin¹

¹Ioffe Institute, St Petersburg, Russia.

Rapid Communications in Mass Spectrometry : RCM

|June 14, 2021

Abstract

Rationale:

The mass spectra of amine thermal ionization on intermetallic NaAu_x emitters differ significantly from those of the same compounds on the surfaces of transition metals and their oxides. The factors underlying these differences are determined through studying the processes taking place on intermetallic surfaces, which give rise to the corresponding mass spectra.

Methods:

The dependence of mass spectral composition and individual line intensity of diethylamine thermal ionization on intermetallic NaAu_x surface on diethylamine pressure, oxygen, sodium atom current and emitter temperature was studied using a magnet sector mass spectrometer.

Results:

Diethylamine mass spectral composition is determined by the reaction between the molecules adsorbed on the NaAu_x surface. Oxygen and sodium concentration on the surface does not affect the mass spectral composition. Mass line intensity depends on diethylamine pressure and emitter temperature affecting the reaction efficiency on the surface.

Conclusions:

Intermetallic NaAu_x is an ionic semiconductor that can provide sufficient lifetime for adsorbed molecules to efficiently interact with each other and with their decomposition products. This creates unique conditions for the formation of various compounds on the surface with their mass exceeding by 2.5 times that of diethylamine.

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